I'm using Qt 4.8.7, which seems to be the last of the line of Qt version 4. I don't want to jump to Qt 5 simply because installs are getting bigger. Granted, they are trying to provide support for more operating systems, but it is very clunky. I looked into Necessitas for Android and the whole process of getting your app onto a mobile phone just seems clunky. Technically it all works, but usability goes out the window. I'm sticking with desktop deployment for now.